The Motorola 68000 is a 1979 16 bit processor which can be compared in terms of performance to a 80286. On the Amiga its clock frequency has been set to 7.2 Mhz compared to the Atari 520 ST 8 Mhz 68000

What you said about the custom chips is correct, but I only said certain games such as those containing vector graphics were faster. The majority benifited from the amigas custom chips.